package calculate;

/**
 * This interface difines the unary opertors
 * 
 * @author Jacky Xu
 *
 */
public interface UnaryOperator {

	/**
	 * This method is the abstract action of the unary operation
	 * 
	 * @param a: operand
	 * @return op(a), op is the operation
	 */
	public double calculate(double a);
}
